# ERC 998 ## **Overview:** The ERC 998 standard within Romulus extends the functionality of traditional NFTs by allowing them to own other NFTs or tokens. This composability opens up possibilities for creating complex asset structures that reflect real-world hierarchies or bundled digital assets. ## **Key Features:** * **Composable Assets:** ERC 998 NFTs can contain other NFTs or tokens, enabling the creation of nested assets. This is useful for scenarios like a game character owning items or a virtual real estate property with multiple buildings. * **Hierarchical Ownership:** The contract supports parent-child relationships between tokens, allowing for structured asset management. * **Integrated Control:** Manage all sub-assets from the main NFT, ensuring seamless control over complex digital assets. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.volary.io/romulus/contracts/erc-998.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.